On two occasions.
Trapped, killed, cleaned, and ate feral hogs once. They tasted OK but were not worth the effort.
Two dogs roaming the neighborhood got hold of a cat. Chased the dogs off and made sure the cat didn't suffer any longer. Not proud about that but it needed to be done.

I would if I had to. I think anybody would, regardless of what they say now. In extraordinary circumstances, no one really knows what they are capable of until they have to act. What some don't realise, in 'fight or flight mode', sometimes there is no 'flight'. Same goes for any animal, naturally. Instinct takes over. [I remember a news piece about a hunter who shot, tracked, and cornered a deer. That deer, having no options but to fight or die, jumped up, and sucker punched the hunter in the head, killing him. BAMF deer.]

Now replace the hunter with a mugger/rapist/serial-mugger-rapist, and the deer with a pretty, little, doe-eyed blonde. You'd think the prior would be victor, right? He's probably killed a person, and found it easy. But NOPE, blondy shives the dude in the neck with a broken beer bottle, and opens a few arteries. That's an extreme situational construct, but the same rules of nature apply. Blondy isn't a trained soldier, or anything of the sort, but essentially a deer in the headlights, herself. Wounded, scared shitless, and not about to miss the premiere of Teen Mom 3, instinct kicks in, adrenaline pumps, and before she realises it, she's standing over a body.
Again, this is just an extreme hypothetical to help illustrate my aforementioned opinion (see; "I think").